I know what you are talking about, I have seen the report button on other forums. and also, not every website out there has the report button.
but since Aeria does not have that, you either have to send in a contact us
to report a post. that goes to a GM.
or if you want to report a post, you can use this form
. it goes to a forum mod.
or you could send a message to a forum mod about a post.